Polishing-wheel.



PATENTED AUG. 11, 1008.

J. W. HYATT.

POLISHING WHEEL.

APPLICATION FILED APR 17 1907 UNITE STATES PATENT OFFICE.

JOHN W. HYATT, F NEWARK, NEW JERSEY.

POLISHING-WHEEL.

To all whom it may concern:

Be it known that I ,J OHN W. HYATT, a citizen of the United States, of141 Commerce street, Newark, county of Essex, and State of New Jersey,have invented certain new and useful Improvements in Polishing-Wheels,fully described and represented in the following specification, and theaccompanying drawings, forming a part of the same.

The object of the invention is to reduce the cost and improve thequality of that class of wheel-bodies upon which abrading material iscemented to be used in polishing and grinding. Such wheel-bodies havebeen made of wood, leather, and other substances, but none of them is caable of preserving the form of the wheel perfectly, as wood shrinksunevenly, and the texture of leather is affected by heat or moisture.

The wheel-body in the present invention is formed of a yielding fibroussubstance, as jute or hair felt, saturated with so-called printersroller-composition ,which is made of glue and glycerin and which has theprop-' erty of setting or hardening to a certain point and thereafterretaining a soft yielding character .and permanent elasticity.

The composition can, without losing its yielding character, be madereadily heatresistant and water-resistant'by the admixture offormaldehyde.

Hair felt of cheap or coarse grade is preferable, as it is very cheap,and when saturated with the printers roller-composition and thecomposition hardened to its normal point. it possesses a perfectlyelastic yielding surface which is of the very best character forsupporting the abrading material in a grind ing or polishing operation.

In such an operation, it is desirable that the abrading material shouldbe sup orted elastically, that it may operate unifhrmly upon variousuneven convex and concave surfaces which require to be polished, and thewheel-body thus constructed possesses such permanent yielding surface,and a very homogeneous consistency. a

The animal or vegetable fiber when disposed irregularly, as in a felt ormat, imparts strength to the wheel-body which resists the centrifugalforce to a certain point, and'the wheel-body may be made of a singledisk, or of a series of disks cemented together, but where a high speedwheel is desired, it may be formed of a series of disks cementedtogether with intermediate layers of woven Specification of LettersPatent.

Application filed April 17, 1907. Serial No. 868,629.

Patented Aug. 11, 1908.

fabric, such layers serving to increase the strength of the wheel andresist the centrifugal force. As the printers roller-compositioncontains glue, it can be used as a cement; and a perfectly homogeneousquality thussecured in the binding material.

The invention will'be understood by reference to the annexed drawing, inwhich I Figure 1 is a side view, and Fig. 2 an edge view of a diskembodying the invention; and Fig. 3 is a transverse section of a wheelcomprising a series of such disks with intermediate canvas layers, and aflanged hub seccured in the disks. Fig. 4 is a side view of thewheel-hub.

In the manufacture of the disks, hair felt, such as is used for boilerfelting, is cut into circular sheets of the desired size and placed in aheated mold containin a fresh fluid mixture of glue, glycerin and water,of suitable proportions to form a stiff jelly when cold, the quantity ofmixture being sufficient to saturate the felt. the mold and slowlypressed to reduce the saturated felt to a suitable thickness, in mostcases about one-third of its original thickness. The pressure density oftexture re uired for the grade of grinding material to e carried and thenature of the work for which the wheel is intended. A lighter pressureis used where a disk of softer or more spongy texture is desired, and aheavier pressure roducing a more firm and solid texture, suc

ferent kinds of grinding work.

Where the disk is to be used alone, as rep resented at a in Fig. 2, ahole I) of suitable size is formed in the center, as shown in Fig. 1,

A cover is placed upon variations in the body of the wheel being desiredfor difis graduated to produce the for securing it upon a spindle, andthe diskis pressed hard enough to give it the strength re uisite toprevent burstm when rotated.

f a wheel of considera le, thickness, as several inches, is required,then a series of the disks is formed as just described, of sufficientnumber to make the wheel, and the disks are then cemented together andto intermediate layers of.canvas c by the same fluid composition, withthe iron hub d in the center having a thin star-shaped or toothed flangee to firmly engage the center disks of the wheel.

The group ofdisks with their hub is firmly pressed together and .uponsuch flange, and aked at a' temperature of about two hundred degrees forseveral hours. Such baking involves a very great ex ense, or of woodwhich does not remain tru y circular, and the present inventionfurnishes -a wheel-body which is superior in quality to either of thesematerials as it is homogeneous in texture, and possesses when roper ymade a slight yieldmg quality whic is of great value in support ingandoperating the abrasive materia a. The wheel-body furnishes a new articleof manufacture which may be made up in assortments of dimensions readyfor use by grinders and polishers in many different arts.

Having thus set forth the nature of the invention what is claimed hereinis:

.l. A polishing wheel comprising yielding hair felt saturated andcemented together with printers roller-composition of per- 'manentlyyielding character.

' 2i A polishing wheel comprising a yieldingfibrous material saturatedand cemented together with printers roller-composition of "permanentlyyielding character and rendered v heat-resistant and water-resistant bythe admixture of formaldehyde.

3. A polishing wheel com rising a series of disksform'ed of a yielding 7air felt material saturated with printers roller-composition ofpermanently yielding character rendered heat resistant and waterresistant b the admixture of formaldeh de, the dis being cementedtogether wit alternate layers of woven fabric by-a cement ofroller-composition, the layers of woven fabric serving to resist thecentrifugal force developedin rotating the wheel.

4. A olishin wheel comprising a central hub wit a toot ed flangeintermediate to its ends, disks of-compressedhair felt applied to thehub at opposite sides of such flange and pressed thereon and cementedtogether by permanently yielding printers roller-comvposition, the poresof the disks being also lled withthe printers roller-composition ofpermanently yielding characterrendered heat-resistant andwater-resistant by the admixture of formaldehyde.

In testimony whereof I have hereunto set my hand in'the presence of twosubscribing witnesses.

JOHN w. HYATT.

I Witnesses: I

..L. LEE, THOMAS SI CRANE.

